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I have had a check engine light on for years. It is a 2001 VW beetle GLX 1.8T, 50k miles. The car gives the PO171 code which is running lean everything indicated a vacuum leak. I have changed all the vacuum lines and the code keeps coming back. The car runs fine, doesn't run rough or stall. I continued to look for a vacuum leak using a smoke tester and found it leaking on the bottom of the VTS Variable Timing Solenoid. I cant tell if there is a gasket or something around this part that would seal this up. Is this a difficult part to replace or repair? Has anyone else had it leak from that location? Any help or advise would be appreciated.
 

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Lean

Running lean means the intake is getting more air than what the maf measures when you start the car & the computer makes throttle adjustments accordingly for the gas to air ratio.
 

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http://wiki.ross-tech.com/wiki/index.php/16555/P0171/000369

Can you post a photo, highlighting the area, that the smoke test revealed a vacuum leak? Obviously, you would want to fix any vacuum leaks; then recheck the fuel trim live data and see if it corrects the problem. Common areas to chech;!would be rhe pcv hoses in the front of the engine and hoses going to the valve cover (these get old deteriorate; get gooey/leak from the hot oily air).

http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info

More testing with live data, might be next and see if ither related issues, are in spec, following the info in the ross tech trouble code link for p0171 (e.g. fuel trim, maf readings, fuel pressure, etc).
 
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